Ultraviolet absorption spectrum and kinetics and mechanism of the self-reaction of 1,1,2,2-tetrafluoroethaneperoxyl radicals in the gas phase at 298 K

1992 ◽  
Vol 96 (26) ◽  
pp. 10875-10879 ◽  
Author(s):  
Ole J. Nielsen ◽  
Thomas Ellermann ◽  
Jens Sehested ◽  
Timothy J. Wallington
Keyword(s):  
Absorption Spectrum ◽  
Gas Phase ◽  
Ultraviolet Absorption ◽  
Kinetics And Mechanism ◽  
The Self ◽  
Ultraviolet Absorption Spectrum

The Near-ultraviolet Absorption Spectrum of Diimide in Liquid Ammonia and its Decomposition between −65 and −38 °C

1974 ◽  
Vol 52 (13) ◽  
pp. 2513-2515 ◽  
Author(s):  
R. A. Back ◽  
C. Willis
Keyword(s):  
Absorption Spectrum ◽  
Gas Phase ◽  
Room Temperature ◽  
Liquid Ammonia ◽  
Vibrational Structure ◽  
Ultraviolet Absorption ◽  
Ultraviolet Absorption Spectrum ◽  
First Order ◽  
Rapid Decomposition ◽  
Near Ultraviolet

The near-ultraviolet absorption spectrum of diimide in liquid ammonia at −50 °C is shifted about 500 Å to the red compared with the gas-phase spectrum, with λmax = 4000 Å. The spectrum is also broadened and the vibrational structure largely obscured. It is suggested that hydrogen bonding is responsible for these changes.Diimide is much more stable in liquid ammonia between −65 and −38 °C than in the gas phase at room temperature. A first-order decay is observed with Arrhenius parameters of A = 1.9 × 103 s−1 and E = 6.6 kcal/mol; this is always preceded by a more rapid, higher-order initial decay which may be related to the rapid decomposition observed during vaporization.

scholarly journals The Near-ultraviolet Absorption Spectrum of Diimide Vapor

1974 ◽  
Vol 52 (6) ◽  
pp. 1006-1012 ◽  
Author(s):  
R. A. Back ◽  
C. Willis ◽  
D. A. Ramsay
Keyword(s):  
Absorption Spectrum ◽  
Bond Length ◽  
Gas Phase ◽  
Absorption Spectra ◽  
Ground State ◽  
Ultraviolet Absorption ◽  
Ultraviolet Absorption Spectrum ◽  
Near Ultraviolet ◽  
Bending Mode ◽  
Franck Condon

Absorption spectra of N2H2 and N2D2 in the gas phase have been obtained in the region 3000–4300 Å, consisting of about 30 diffuse bands for each compound. Long progressions in the spectra are attributed to excitation of the H—N=N bending mode, v2′, in the upper state, with much shorter progressions arising from the N=N stretching mode, v3′; values of v2′ = 1215 and 910 cm−1 and v3′ = 1550 and 1440 cm−1 were estimated for N2H2 and N2D2 respectively.The spectra are attributed to the 1Bg ← 1Ag(π* ← n+) transition of trans diimide, probably made allowed by vibronic interaction. From Franck–Condon calculations the H—N=N angle in the upper state was estimated to be 132 ± 2°, an increase of 25° from the ground-state value; the increase in the N=N bond length was estimated to be about 0.05 Å.

UV absorption spectrum, and kinetics and mechanism of the self reaction of CF3CF2O2 radicals in the gas phase at 295 K

1993 ◽  
Vol 25 (9) ◽  
pp. 701-717 ◽  
Author(s):  
Jens Sehested ◽  
Thomas Ellermann ◽  
Ole John Nielsen ◽  
Timothy J. Wallington ◽  
Michael D. Hurley
Keyword(s):  
Absorption Spectrum ◽  
Gas Phase ◽  
Kinetics And Mechanism ◽  
The Self ◽  
Uv Absorption ◽  
Uv Absorption Spectrum

ChemInform Abstract: UV Absorption Spectrum, and Kinetics and Mechanism of the Self Reaction of CF3CF2O2 Radicals in the Gas Phase at 295 K.

ChemInform ◽  
2010 ◽  
Vol 24 (49) ◽  
pp. no-no
Author(s):  
J. SEHESTED ◽  
T. ELLERMANN ◽  
O. J. NIELSEN ◽  
T. J. WALLINGTON ◽  
M. D. HURLEY
Keyword(s):  
Absorption Spectrum ◽  
Gas Phase ◽  
Kinetics And Mechanism ◽  
The Self ◽  
Uv Absorption ◽  
Uv Absorption Spectrum
Sign in / Sign up

Export Citation Format

Share Document